Reproductive Biology

Step 1: Understanding age pyramid and population growth.
An age pyramid is a graphical representation of the age distribution of a population. The shape of the pyramid can indicate the growth status of the population.
Step 2: Analyzing the scenario.
- Expanding (Option 1): If the number of individuals in the reproductive age group is more than in the pre-reproductive group, it indicates that the population is expanding. The shape of the age pyramid would have a broad base and a narrow top, indicating a higher birth rate and potential for future growth.
- Stable (Option 2): A stable population would show a more uniform distribution of age groups, without a disproportionate number of individuals in the reproductive age group.
- Declining (Option 3): A declining population would show more individuals in older age groups and fewer in the reproductive or pre-reproductive age groups.
- Homeostasis (Option 4): Homeostasis refers to the balance of internal processes, not directly related to population growth.
Step 3: Conclusion.
The correct answer is Expanding, as an imbalance favoring the reproductive age group suggests population growth.
Final Answer:

Step 1: Identify Amniocentesis.
Amniocentesis is a technique used to test the sex of the fetus by sampling amniotic fluid. Therefore, it corresponds to (IV) Testing of sex.
Step 2: Understand Maternal Mortality Rate.
Maternal mortality rate refers to the death rate of mothers during childbirth, so it corresponds to (III) Death rate.
Step 3: Understand Vasectomy.
Vasectomy involves the ligation of the vas deferens for male sterilization, so it corresponds to (II) Ligation of vas deferens.
Step 4: Understand Tubectomy.
Tubectomy involves the ligation of the fallopian tubes in females, so it corresponds to (I) Ligation of fallopian tube.
Thus, the correct match is:
(A) - (IV), (B) - (III), (C) - (II), (D) - (I).
Final Answer:

The primary female sex organs are those that are directly involved in reproduction. These organs are responsible for producing gametes and supporting reproduction.
Step 1: Analyzing the options.
- Mammary glands (Option 1): Mammary glands are responsible for milk production and breastfeeding, but they are not the primary sex organs.
- Uterus (Option 2): The uterus is important for nurturing the developing embryo, but it is not the primary organ for producing eggs.
- Ovaries (Option 3): The ovaries are the primary female sex organs. They produce eggs (ova) and secrete hormones like estrogen and progesterone, which are crucial for the reproductive system.
- Cervix (Option 4): The cervix is part of the female reproductive system, but it is not the primary organ for reproduction.
Step 2: Conclusion.
The primary female sex organ is the ovaries.
Final Answer: